The reason for the explosion of the continuous casting mold?The continuous casting mold is the main component of the continuous casting machine and is called t

The reason for the explosion of the continuous casting mold?

The continuous casting mold is the main component of the continuous casting machine and is called the "heart" of the continuous casting equipment. The traditional mold manufacturing process is extrusion molding, because the forming mechanism does not match the strain characteristics of the tube blank, so that its shape, dimensional accuracy, and inner and outer hardness are difficult to reach the application scale of high-efficiency molds.

Explosive hardening of the mold copper plate is to lay gunpowder on the outside of the mold copper plate. The normal impact load of the gunpowder explosion causes the mold copper plate to rush to the base at a high speed, which will cause a large amount of deformation when the outside is in contact with the base. The structure and structure of a certain deep layer under the copper plate of the mold have undergone transformation to reach the hardening target. This is of great significance to the application life of the tube mold, to improve the steel billet drawing speed, to reduce the energy consumption of China's steel production, and to improve the upgrading of household goods. Explosive hardening of the mold copper plate is a hardening effect accompanying a special forming method. With this kind of method, the outer surface can be hardened by explosive forming of molds of different thickness or shape. And explosive forming has the characteristics of high forming accuracy, high efficiency and energy saving, light operation and good hardening results. This paper is based on the search and browsing of a large number of international and foreign related documents, and the explosion hardening experiment research on the three kinds of molds that often use copper plates. And stopped the analysis of the hardening mechanism. Annotation of experimental results:

1. The explosive hardening method can successfully complete the hardening of the copper plate of the mold and the improvement of wear resistance, and its hardness can satisfy the use of high-efficiency molds. This technique provides a useful new way for the molding of the mold and the hardening of the mold copper plate.

2. Experimental annotation results annotations, using explosive hardening method to stop hardening the 22.5mm thick DHP copper plate and AgCu copper plate, the uniform unit area charge and the annealing state hardness separation increased by 87.8%, 153%, and the wear resistance separation improved 36.3% and 20%. However, the hardness of Cu-CrZr copper plate has not changed significantly after the explosion impact, and the wear resistance has not been significantly improved.

3. Through the indecent observation of the microstructure on the outside of the copper plate after the explosion impact, the analysis and study of the explosion hardening mechanism of the mold are carried out, and it is believed that the microstructure of the explosion hardening of the mold copper plate is important for the plasticity of the hardened layer. It consists of deformation strengthening hardening mechanism, fine grain strengthening hardening mechanism of hardened layer, deformation twin strengthening hardening mechanism of hardened layer, static strain aging hardening mechanism and precipitation hardening mechanism.

4. Through the analysis of the experimental results and explosive hardening effect results of three types of copper materials, the industrial application of explosive forming techniques for continuous casting molds has laid the foundation for the main experimental basis for improving the application life of continuous casting molds. At the same time, it provides the main basis for the expansion of the external hardening technique to the hardening treatment of the copper plate of the plate mold.